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* fix(query): handle empty operands in PromQL or Signed-off-by: discord9 <discord9@163.com> * fix(query): preserve schema for empty histograms Signed-off-by: discord9 <discord9@163.com> * fix(query): preserve set operation context Signed-off-by: discord9 <discord9@163.com> * refactor(query): simplify zero-column error Signed-off-by: discord9 <discord9@163.com> --------- Signed-off-by: discord9 <discord9@163.com>